Don't always trust the wait times posted. On Sat around 11:30PM right before extra magic hours my brother and I were at the parks finishing up any last minute rides and saw that Rapunzel was listing at 10 mins wait so we walked into the line. Got inside and looked over and saw that Anna and Elas's line was even shorter (almost completely inside the gallery room). The wait for them was listed at 45 but we knew that wasn't possible with a shorter line than the one being listed at 10 mins so went back out and tried that line instead. We were right. While the wait was slightly longer than the Rapunzel line but it was no where near 45 mins long. It ended up being closer to 15 mins and that's most likely because each princess takes time to really talk with everyone.
Last year during
MNSSHP I meet them right after the parade with a similar 15-20 min wait. I watched the parade from Liberty Square and started moving as soon as the last float went by. Now the day that I went it was also kinda rainy so that may have discouraged the crowds a bit but it's wasn't that bad.